#!/usr/bin/env python

# Copyright (c) 2013 Google Inc. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""
Make sure binary is relinked when manifest settings are changed.
"""

import os
import TestGyp

test = TestGyp.TestGyp(formats=['msvs', 'ninja'], platforms=['win32'], disable='Need to solve win32api.LoadLibrary problems')

import pywintypes
import win32api
import winerror

RT_MANIFEST = 24

class LoadLibrary(object):
  """Context manager for loading and releasing binaries in Windows.
  Yields the handle of the binary loaded."""
  def __init__(self, path):
    self._path = path
    self._handle = None

  def __enter__(self):
    self._handle = win32api.LoadLibrary(self._path)
    return self._handle

  def __exit__(self, type, value, traceback):
    win32api.FreeLibrary(self._handle)

def extract_manifest(path, resource_name):
  """Reads manifest from |path| and returns it as a string.
  Returns None is there is no such manifest."""
  with LoadLibrary(path) as handle:
    try:
      return win32api.LoadResource(
          handle, RT_MANIFEST, resource_name).decode('utf-8', 'ignore')
    except pywintypes.error as error:
      if error.args[0] == winerror.ERROR_RESOURCE_DATA_NOT_FOUND:
        return None
      else:
        raise

CHDIR = 'linker-flags'

gyp_template = '''
{
'targets': [
  {
    'target_name': 'test_update_manifest',
    'type': 'executable',
    'sources': ['hello.cc'],
    'msvs_settings': {
      'VCLinkerTool': {
        'EnableUAC': 'true',
        'UACExecutionLevel': '%(uac_execution_level)d',
      },
      'VCManifestTool': {
        'EmbedManifest': 'true',
        'AdditionalManifestFiles': '%(additional_manifest_files)s',
      },
    },
  },
],
}
'''

gypfile = 'update-manifest.gyp'

def WriteAndUpdate(uac_execution_level, additional_manifest_files, do_build):
  with open(os.path.join(CHDIR, gypfile), 'w') as f:
    f.write(gyp_template % {
      'uac_execution_level': uac_execution_level,
      'additional_manifest_files': additional_manifest_files,
    })
  test.run_gyp(gypfile, chdir=CHDIR)
  if do_build:
    test.build(gypfile, chdir=CHDIR)
    exe_file = test.built_file_path('test_update_manifest.exe', chdir=CHDIR)
    return extract_manifest(exe_file, 1)

manifest = WriteAndUpdate(0, '', True)
test.fail_test('asInvoker' not in manifest)
test.fail_test('35138b9a-5d96-4fbd-8e2d-a2440225f93a' in manifest)

# Make sure that updating .gyp and regenerating doesn't cause a rebuild.
WriteAndUpdate(0, '', False)
test.up_to_date(gypfile, test.ALL, chdir=CHDIR)

# But make sure that changing a manifest property does cause a relink.
manifest = WriteAndUpdate(2, '', True)
test.fail_test('requireAdministrator' not in manifest)

# Adding a manifest causes a rebuild.
manifest = WriteAndUpdate(2, 'extra.manifest', True)
test.fail_test('35138b9a-5d96-4fbd-8e2d-a2440225f93a' not in manifest)
